Process of manufacturing pneumatic tires.



UNITED STATES PATENT OFFICE.

ARTHURl-IUDSON MARKS, OF AKRON, OHIO.`

PROCESS OF MANUFACTURING PNEUMATIC TlRES.

No. sesam,

Spacication of Letters Patent.

Patented Nov. 27. 1906.

Application filed January i3. 1906. anal Re. 295,952.

To will whom it may concerm lBe it known' that lARTHUR HUDSON MARKS, s.citizen of the United States, residingA at Akron, in the county ofSummit sind Stato of Ohio, have invented new and usefull phregm innertube-that xs, en inner tune formed with two eir-cheml ers, euch one inrflataole independent of the other.

1lil/*ith the above object in View the inven tion` consists in thenovelfcntures Vof construetion hereinafter fully described, ertiouierlypointed out in the cleiins, and c esriy illus.

trated by the accompanying drawings, in Which- Figure 1 is s. viewshowin the mandrel with the first layer of materia. laced there on; Fig.2, a View, partly in e evetion and partly insection, showin the mandrelwitli the two layers of materia ,1 Fi 3, e seetionei View on the line 33 of Fig. l. 3 ig. 4, e similar view on the line 4 4 of Flg. 2, theouter layer bein shown preparatory to uniting one of its c ges with theinner loyer; Fig. .5, e secf tione View on the iine 5 5 of Fig. 2; Fig.6, e sectional view tliroujh the eonipeterl telic, teken et the joint.;Fig. e sectional View showing the inner air-chamber collapsed; Fig.5%also e cross-sectional view showing a. modified construction in whichthe tube is formed of two complete layers oi" nmteriu'.; Fig. 9, asectional View of e modified construction, showing the auxiliaryair-chember collapsed; Fig. 10, a sectionei vienv of e, oor tion of thetube in position upon n mandrel, showing the culle of tlw outer leyerburned back to permit he joining of thc ends of the inner layer; Fig.11, a. similar View illustrat ing the manner in which the ends of thelayers forrnin ,A the tube are united, end Fig. 12 elsections. view ofe. portion of the modification illustrated in Figs, 8 und 9. The innertube here illustrated is Wh et i term n. "double or "cliayhregm innertube, the some being former with two airchsrnbers, one primary and theother nnxi ier):r or second ery, each having e velue for infeting theinner or auxiliary chamber being 'normelly defated. Upon puncture of theouter or primary air-chamber the secondary one In sy be inflated, sothat it is not necessary to repair thetire on thc road in ceso ofpunctnreunless of course the auxiliary aib chamber should be puncturedafter it has been broughtinto use. Y in carrying out my im rovedvproceselayer 1, of e suitable rub er compouniisl placed over e strei ht smoothniendrelQ."

pon this ieyer en extending over @about one half of the circumferencethereof. 1,8 placed e. second layer 3 of the same mete-nal, which iscemented et its extreme edges othe. irst loyer, e layer of Wet sbepstoneha first been piaceri between the two layers o 7e rubber for the purposeof preventing adhesion, excepting at the extreme edges Yof the secondlayer. At its extreme enr, s the sec ond layer is formed comletelyltubuler and is not united to the rst ayer, thus formiulgf thecuffs 4. lThe structure is then partl'y vulcanized, und after thisoperation 1S per?.

formed it is placed over n collapsible meng-3l drel 5. The cuffs forminthe ends of the.v primary tube ere folded selves, so es to be out of theway, and, the ends of the secondary tube are brought. Atogether endvulcanized. A hole is mede in the inner peripiierj,7 of tile tube, endthe coiF lapsihle mandrel is removed through this ori S5 iii-e insections, the hole through which the collapsible mandrel is removedbeing citer werd used for inserting one of the ineting i valves. Thecuffs, of the primary tube are then ioincd end the whole structureplaced e in e circuler mold, inlieted With oir or steam,

und lle ruicnnizstion completed. A

As shown in Figs. S, 9, and 12, the outer loyer een be mede tocompletely surround the inner loyer, being united thereto for a portionof its circumference, thus forming two complete tubes, the outer,excepting at its ends, being united to the inner one et a, portion ofits pori hery.

Ravine thus fu ly described my invention, 1 oo what. i cfiim as new, enddesire to secure by Letters etent of the United States, isM

The improved process of forming e. dou ble or dicplireg. i inner tubefor pneumatic rires consisting in the following ste s: rst,

the placing of a. layer of vulcenieeo e nieteriel about n Straightmandrel; second, the placing of o second layer upon the first layer anduntilw the same thereto et e portion o its circurnierence; third, partlyvulcenizing no .,third, part` the LWL layers; fourth, remnving sind strmLure from the Struigl'il mimdrnl mid )hiring Elie sami upon fr (sulla)silih nnindrrfl; lil'lh, rolling brick llhu ends nl thv unir-r lnyvr.:md uniting; the ndsiol tho innvr hiyvr; sixth, uniting the ends of theouter hiyrir; svvunili, removing the circular nnindrol; and niglilh,(',mnplnlirnhr lha vulrmiiznlinn nf liliv sirm-` ture.

2. The improved prnvvss nf forming' :i diniblo or diaphragm inn r mlmfor pnuunnrliitires consisting in iliu following sirops: Iirst, theplacing of a layvr ril' v'nlcilnizulilv mam-- rial about a straightmm'idrcl; second, thv placing of a Second lirvvr upon thv` iirsti layrrand unitin 1' the sami.' lhvrvtn ut n portion nl' its circuni ercncc,with tlm uxi'oplinn nl' its respectivo ends which um fnrmvd into r'ull'sentirely svmratnd from thv innor lnlwr;

ly 'vulcnnicing thv two layers; folrth, removing said ritructurv fromlili(l t'rali ht mandrel and planing the sani@ upon a col apsiblemandrel; filth, rolling buck the buffs and uniting thqends of the innerlayer: siirfliJlniting Said CHTS; sovenlfli, removing thc circularmandrilJ und eighth, cumpleting lh(` vulvnnizntinn ul' tho strucliirv.

l. The` mvi hud nl juininggiilwy vndsnf zi doniY lilv nr diaphragm innvrlinhu fm' pnvunmtic.

tirosI mmsisling in l'uldinrr lim-k thv midi` uf ilul prilmlr'j llilwIilu-n 1i^lvsr0ping Llw ends nl' llm socmndiiry lnlw ovvi' :i cullapsiblnl mandrel, thon uniting` liv vnds nl' lhu prix marry llihv, :mdlinzllly, viilvnnizing the l wlmh'A Y l 4. 'lhu mctlind nl' jninin;r thevndsnf lidnul liliK nr diaphragm innor tnlufur pnmimnti(- lirw`vnnsislingf nl' first joining 1hrx ('nds nl" n xwnndilny lnlw m'lr nf'ullziipsililf mandrel, thun willidrmring sind mimdrvl l'rnm th(` sulmiduriV tilln-r thon iinlvsmping llw ends of tlm primar) lulu', thonplacing 1li(l wlinlv tuinl in :in ondlvss i-irvlllar mold, mid finzill)vvnhnnt izinr lliv wllolr. l ln lvslinmny where-wf I iillix my signaturein prvsinrv nl' two snlisnrihing wiinvssvs.

ARTHUR HUDSON MARKS. Wim-H5051 S. HART, J. E. Aliens.

